Spa and holiday home / lodge recommendations?

I’m looking to book a spa weekend away for 6 people, and want us to stay in a lodge or similar so we’re all together, rather than a hotel with separate rooms.

My issue is that I have no idea where to start looking. I don’t know anything about spas, and I’m not sure where I can find a good one that is also close to some sort of lodge / holiday park.

We’re based in Fife but happy to drive further out!

Has anyone had a similar holiday and have recommendations for both the spa and accommodation?

Thanks in advance!